<!--<body>
    <script type="text/javascript">
        //<![CDATA[
        var currentIndex = 0;

        function changeBg() {
            //定义要切换的背景图片，双引号里面"1.jpg","2.jpg","3.jpg","4.jpg"，可以放任意多个用,隔开
            var bgImgs = ["1.jpg", "2.jpg", "3.jpg", "4.jpg"];
            if (currentIndex >= bgImgs.length)
                currentIndex = 0;
            var obj = document.getElementsByTagName("body")[0];
            obj.style.backgroundImage = "url(" + bgImgs[currentIndex] + ")";
            currentIndex += 1;
        }
        setInterval("changeBg()", 3000); //设定定时切换，单位为毫秒这里是3000 毫秒
        //]]>
    </script>
</body>-->
<html>

<head>
    <title>JS定时自动切换网页背景色丨站长技术教程网丨www.update8.com</title>
</head>

<body bgColor="#ffffff" onload="chgCol(); pingpong();">
    <script language="JavaScript">
        <!-- Hide from JavaScript-Impaired Browsers
        var pos = 10;

        function initArray() {
            this.length = initArray.arguments.length;
            for (var i = 0; i < this.length; i++) {
                this[i] = initArray.arguments[i];
            }
        }
        var col = new initArray("4b", "5b", "8b", "8b");
        col[0] = "yellow";
        col[1] = "coral";
        col[2] = "orange";
        col[3] = "red";
        col[4] = "greenyellow";
        col[5] = "lime";
        col[6] = "turquoise";
        col[7] = "coral";
        col[8] = "blueviolet";
        col[9] = "violet";

        function chgCol() {
            pos++;
            if (pos < 0 || pos > 9) {
                pos = 0;
            }
            document.bgColor = col[pos];
            setTimeout("chgCol()", 1);
        }
        var yourwords = "不斷變化背景色彩";
        var buffer1 = "           ";
        var buffer2 = "           ";
        var message1 = buffer1 + yourwords + buffer2;
        var dir = "left";
        var speed = 150;

        function pingpong() {
            if (dir == "left") {
                message2 = message1.substring(2, message1.length) + "  ";
                window.status = message2;
                setTimeout("pingpong();", speed);
                message1 = message2;
                if (message1.substring(0, 1) == "*") dir = "right";
            } else {
                message2 = "  " + message1.substring(0, message1.length - 2);
                window.status = message2;
                setTimeout("pingpong();", speed);
                message1 = message2;
                if (message1.substring(message1.length - 1, message1.length) == "*") dir = "left";
            }
        } // -->
    </script>
</body>

</html>